Long - a director, producer and cinematographer - was known for titles such as On The Game, Eskimo Nell and The Wife Swappers. He also launched a series of Adventures films, which began with Adventures Of A Taxi Driver, as a rival to the successful Confessions movies starring Robin Askwith.

His family said the movie-maker - who lived in Buckinghamshire - died on Monday from "natural causes".

Long produced a series of successful movies over the period of a quarter of a century blending bawdy comedy with female nudity and he was a millionaire by the age of 36.

He once said: "It wasn't easy making an exploitation movie. It needed a fresh script, careful planning and a lot of skill."

He began his career as a photographer for Picture Post and after serving in the RAF he began taking nude photos for a men's magazine, then turned to making moving pictures with his company Stag Films turning out more than 150 short films.

One of his 1960s films West End Jungle - a documentary about Soho's sex industry - was banned when it was made in the early 1960s, and caused an outcry at the time, but went on to be screened by BBC Four.

His Adventures Of A Taxi Driver, made for £30,000, became a box office hit and was sold to 36 countries.

Long also set up a successful distribution firm and his post-production company Salon has gone on to work on films such as Batman Begins.